First, factorise 14 and 21:
Factors of 14: 2,7
Factors of 21: 3,7.
Highlight common factors:
14: 2,7
21: 7,3
Common factors: 7
The product of these common factors is:7=7.
This number, 7, is your greatest common factor:
Greatest Common Factor( 14, 21 ) = 7.
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